\begin{tikzpicture}
    \tkzDefPoints{0/0/O}
    \tkzDefPoint(110:1.5){A}
    \tkzDefPoint(200:1.5){B}
    \tkzDefPoint(340:1.5){C}
    \tkzDefPoint(45:1.5){D'}
    \tkzDefPointOnLine[pos=0.8](B,D')  \tkzGetPoint{D}

    \tkzDrawCircle[thick](O,A)
    \tkzDrawPolygon(A,B,C,D)
    \tkzDrawSegments[dashed](A,D'  C,D'  B,D')
    \tkzLabelPoints[above left](A)
    \tkzLabelPoints[left](B)
    \tkzLabelPoints[right](C)
    \tkzLabelPoints[left=.3em](D)
    \tkzLabelPoints[above right](D')
\end{tikzpicture}

